Used in commercial grooved-end piping systems 2" through 12".
The uniqueness of the Series 7700 Gruvlok Butterfly Valve
begins with the spherical bore of the disc seat area. This
facilitates a constant DISC-TO-SEAT loading that maintains a
leak tight stem seal regardless of disc position. The stem sealing
force is constant through the full disc cycle and operating
torques are kept low which increases valve life. The design
provides a bubble tight seal from full vacuum to 300 psi when
the valve is closed. The valve is rated for dead-end service to a
full pressure rating of 300 psi.

The stem-to-disc connection provides zero backlash. The high
strength, corrosion resistant, stainless steel stems are blow-out
proof. Each stem is fitted with a secondary seal that also
provides a lifetime lubrication chamber.
The Series 7700 valve is designed with the contractor in mind.
The valve body is a rugged one-piece casting with an integral
mounting base for gear operator or handle actuation, while
providing room for a minimum of 2" of pipe insulation. The
valve is designed and manufactured to meet or exceed the
requirements of MSS SP-67.